[Bug 225663] FreeBSD 11.1-STABLE on root zfs panics on boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225663

            Bug ID: 225663
           Summary: FreeBSD 11.1-STABLE on root zfs panics on boot
           Product: Base System
           Version: 11.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dog at virtual.org.ua

uname -a:
FreeBSD dog 11.1-STABLE FreeBSD 11.1-STABLE #0 r328208: Sun Feb  4 12:34:52 EET
2018     root at dog:/usr/obj/usr/src/sys/GENERIC  amd64

After upgrade from revision r328208 to r328849 my system panics when tries to
mount root fs during the boot boot process and instantaneously reboots. After
rolling back to previous OS revision the problem disappears.

My root zpool/zfs has the latest version:

dog at dog:~ % zpool upgrade -v
This system supports ZFS pool feature flags.

The following features are supported:

FEAT DESCRIPTION
-------------------------------------------------------------
async_destroy                         (read-only compatible)
     Destroy filesystems asynchronously.
empty_bpobj                           (read-only compatible)
     Snapshots use less space.
lz4_compress                         
     LZ4 compression algorithm support.
multi_vdev_crash_dump                
     Crash dumps to multiple vdev pools.
spacemap_histogram                    (read-only compatible)
     Spacemaps maintain space histograms.
enabled_txg                           (read-only compatible)
     Record txg at which a feature is enabled
hole_birth                           
     Retain hole birth txg for more precise zfs send
extensible_dataset                   
     Enhanced dataset functionality, used by other features.
embedded_data                        
     Blocks which compress very well use even less space.
bookmarks                             (read-only compatible)
     "zfs bookmark" command
filesystem_limits                     (read-only compatible)
     Filesystem and snapshot limits.
large_blocks                         
     Support for blocks larger than 128KB.
sha512                               
     SHA-512/256 hash algorithm.
skein                                
     Skein hash algorithm.

The following legacy versions are also supported:

VER  DESCRIPTION
---  --------------------------------------------------------
 1   Initial ZFS version
 2   Ditto blocks (replicated metadata)
 3   Hot spares and double parity RAID-Z
 4   zpool history
 5   Compression using the gzip algorithm
 6   bootfs pool property
 7   Separate intent log devices
 8   Delegated administration
 9   refquota and refreservation properties
 10  Cache devices
 11  Improved scrub performance
 12  Snapshot properties
 13  snapused property
 14  passthrough-x aclinherit
 15  user/group space accounting
 16  stmf property support
 17  Triple-parity RAID-Z
 18  Snapshot user holds
 19  Log device removal
 20  Compression using zle (zero-length encoding)
 21  Deduplication
 22  Received properties
 23  Slim ZIL
 24  System attributes
 25  Improved scrub stats
 26  Improved snapshot deletion performance
 27  Improved snapshot creation performance
 28  Multiple vdev replacements

For more information on a particular version, including supported releases,
see the ZFS Administration Guide.

dog at dog:~ % zfs upgrade -v
The following filesystem versions are supported:

VER  DESCRIPTION
---  --------------------------------------------------------
 1   Initial ZFS filesystem version
 2   Enhanced directory entries
 3   Case insensitive and filesystem user identifier (FUID)
 4   userquota, groupquota properties
 5   System attributes

For more information on a particular version, including supported releases,
see the ZFS Administration Guide.

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